RLiveObjectService.delete throws NPE if entity doesn't exist. #1401

redisson/src/main/java/org/redisson/RedissonLiveObjectService.java

@@ -485,8 +485,12 @@ public class RedissonLiveObjectService implements RLiveObjectService {
     }
 
     @Override
-    public <T, K> void delete(Class<T> entityClass, K id) {
+    public <T, K> boolean delete(Class<T> entityClass, K id) {
-        asLiveObject(get(entityClass, id)).delete();
+        T entity = get(entityClass, id);
+        if (entity == null) {
+            return false;
+        }
+        return asLiveObject(entity).delete();
     }
 
     @Override

redisson/src/main/java/org/redisson/api/RLiveObjectService.java

@@ -120,8 +120,10 @@ public interface RLiveObjectService {
      * @param <K> Key type
      * @param entityClass - object class
      * @param id - object id
+     * 
+     * @return <code>true</code> if entity was deleted successfully, <code>false</code> otherwise 
      */
-    <T, K> void delete(Class<T> entityClass, K id);
+    <T, K> boolean delete(Class<T> entityClass, K id);
     
     /**
      * To cast the instance to RLiveObject instance.

redisson/src/test/java/org/redisson/RedissonLiveObjectServiceTest.java

@@ -1401,6 +1401,11 @@ public class RedissonLiveObjectServiceTest extends BaseTest {
         assertThat(redisson.getKeys().count()).isEqualTo(1);
     }
 
+    @Test
+    public void testDeleteNotExisted() {
+        RLiveObjectService service = redisson.getLiveObjectService();
+        assertThat(service.delete(Customer.class, "id")).isFalse();
+    }
     
     @Test
     public void testDelete() {